diff --git a/common/RenderTiles.hpp b/common/RenderTiles.hpp
index bcc508b87..3f47fb462 100644
--- a/common/RenderTiles.hpp
+++ b/common/RenderTiles.hpp
@@ -228,7 +228,6 @@ namespace RenderTiles
         const int pixelWidth = tileCombined.getWidth();
         const int pixelHeight = tileCombined.getHeight();
         assert (pixelWidth > 0 && pixelHeight > 0);
-        assert (pixelWidth <= 256 && pixelHeight <= 256);
         const size_t pixmapWidth = tilesByX * pixelWidth;
         const size_t pixmapHeight = tilesByY * pixelHeight;
 
@@ -311,6 +310,7 @@ namespace RenderTiles
                         {
                             // Can we create a delta ?
                             LOG_TRC("Compress new tile #" << tileIndex);
+                            assert(pixelWidth <= 256 && pixelHeight <= 256);
                             deltaGen.compressOrDelta(pixmap.data(), offsetX, offsetY,
                                                      pixelWidth, pixelHeight,
                                                      pixmapWidth, pixmapHeight,